Suzuki VZ800 Service Manual page 218

Step 1 (When indicating P1654-L:)
1) Remove the fuel tank. (6-3)
2) Turn the ignition switch OFF.
3) Check the STP sensor coupler for loose or poor contacts.
If OK, then check the STP sensor lead wire continuity.
4) Disconnect the TO sensor coupler.
5) Check the continuity between Y/W wire C and ground.
6) Also, check the continuity between Y/W wire C and B/Br wire
B. If the sound is not heard from the tester, the circuit condi-
tion is OK.
7) Remove the right frame cover. (8-4)
8) Remove the ECM bracket (5-38) and disconnect the
ECM coupler.
9) Check the continuity between Y/W wire C and terminal 4.
10)Also, check the continuity between Red wire A and terminal
6.
 STPS lead wire continuity: Continuity ()
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Continuity test ()
Is the continuity OK?
YES Go to Step 1 (5-60) and go to Step 2.
Red or Y/W wire open, or Y/W wire shorted to
NO
ground
11)After repairing the trouble, clear the DTC using SDS tool.
(5-25)
1
1
1
ECM coupler (Harness side)
FI SYSTEM 5-61